Finding the Fourth Proportional to 1,407.69, 1,942.47 and 818.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.69 : 1,942.47 = 818.19 : x
2. Step 2: Convert to fraction form
   1,407.69/1,942.47 = 818.19/x
3. Step 3: Cross multiply
   1,407.69x = 1,942.47 × 818.19
4. Step 4: Simplify right side
   1,407.69x = 1,589,309.53
5. Step 5: Solve for x
   x = 1,589,309.53/1,407.69
6. Step 6: Final answer
   x = 1,129.02